Pump



Jan. 13, 1942. c. A. ERlcKsoN PUMP Lam Aaa/V411 Filed Dec. 20. 1940 W Jo R 6 v m W m w Patented Jan. l3, 1942 UNITED STATES PATENT OFFICE PUMP g Charles A. Erickson, Chicago, Ill., assignor to United Specialties Company, Chicago, Ill., a corporation of Delaware Application December zo, 1940, serial No. 370,992

13 Claims.

This invention relates to a pump and to one primarily adapted for use in the supply of fuel for internal combustion engines, although it is not limited to that use. One of the objects of the invention is to provide a simple pump conagainst the member 2|, which is threaded to be struction having a minimum of parts and so arreceived' in the threaded perforation |4. The ranged that as far as possible all working parts member 2| carries a strainer 22. As here shown, of the assembly are positioned within the general the strainer is formed of screen cloth. Any other outline of the pump chamber to effect an economy suitable screening or filtering member might be in size and space utilized. Another object is to substituted for it. A bypass 23 leads from the provide a pump of the type indicated without the space |5 and is controlled by a valve 24 which is usual storage or accumulating vessel. Another provided with a handle 25 by means of which itobject is to provide a pump having within itself may be rotated for adjustment. A spring 26 may excess vapor capacity which provides the effect of be added if desired. a vapor dome without additional parts. An outlet passage 21 leads from the pump Other objects will appear from time to time chamber and may be interiorly threaded to rethroughout the specification and the claims. ceive a pipe or conduit if desired. This passage' The invention is illustrated more or less dialeads downwardly aS at 28 and may be Closed by grammatically in the accompanying drawing, a valve 29, which is preferably seated on a rewherein; movable valve cage'30. A spring 3| tends, when Figure 1 is a Vertical cross sectional view of the pump;

Figure 2 is a transverse section taken at line 2-2 of Figure l with parts omitted and parts brok'en away;

Figure 3 is a Vertical sectional detail showing a modified construction from which the additional vapor dome has been omitted;

Figure 4 is a sectional detail showing a modification of the spring supporting means.

Like parts are designated by like characters throughout the specification and the dra'vving.

The pump is formed in general with three main housing parts. a spring chamber 2. One or more perforations or openings 3 provide communication between the spring chamber 2 and the outer air. Projecting partly within the chamber 2 is a spring passage and retainer 4. 5 is an outwardly extending branch communicating with the passage 4 and open at its outer end as at 6. About the outer end a flange 'l may be positioned for attachment of the pump to any suitable support. A pocket 8 is formed within the housing member and it has an open outer end. Formed, preferably within the passage 5, is a shoulder 9.

|9 is a second housing part. It forms, among other things, th'e upper part of the pump chamber or space |2 is an inlet passage through fn which fluid to be pumped enters the housing. It d 41 is a packing member which is positioned within may be interiorly threaded as shown to receive a the bead 46 and between the housing member 42 supply pipe or passage member. Formed within and a suitably inclined flange 41a on the vapor the housing is a preferably generally annular (10m6 DOrOn 33. space |3 to which the inlet passage |2 discharges. a; The pumping mechanism proper includes a A threaded perforation |4 leads from the chamdiaphragm 49, the edges of which are 'engaged ber |3 to a space or chamber |5 into which a between the housing members and |0. These raised spring seat member |6 projects. A pastwo housing members may be secured together by sage leads from the space |5 to the pump bolts, screws or otherwise as desired. A dia'- chamber The member |6 is notched as at to phragm guide 49 is provided with a fiange 50 and is a lower housing part having 8. There may be a plurality of such notches or only a single notch. A spring' 9 has one end seated about the member l6 and bears at its other end against a valve 20. This valve may be seated free to do so, to hold the valve 29 seated. This spring bears at one end against the valve and is positioned about an inwardly projecting member 32. valve 29 upwardly through a passage-definlng member 34 which is preferably formed asa part of the housing member IO and is positioned generally centrally of the pump. At its upper end the member 34 is threaded as at 35 to receive the lower portion 36 of a 'vapor dome. Secured to this lower portion is a second or upper portion 31 of. the vapor dome. Between the members 36 and 31 the edge of a bafile 38 is received. This blafile is perforated adjacent its edges as at 39, 39. It is upwardly deflected as at 4'll'and it is imperforate except for the perforations 39 situated adjacent its edges. Formed also in the passage member 34 is a guiding cavity or space 4|.

The third housing member comprises a cover 42 which is positioned about the upper edge of the housing member IO. This upper edge is preferably beveled as at 43. 44 is a packing member positioned between the beveled edge 43 of the housing member IO and the adjacent edge of the housing member 42. The housing member 42 is perforated as at 45 and is positioned about but preferably out of contact with the threaded upper end of the member 34, 35. The housing member 42 is provided with a bead or raised portion 46.

A passage 33 leads from the space above the extends upwardly into the guiding space 4|. .0rdinarily, the guide 49 is out of contact with the inner surface of the space ll but may contact that surface for guiding purposes. A diaphragm reenforcing disc ll is positioned on the side of the diaphragm opposite the ange 5|! and a spring loop member 52 is formed integrally with it or positioned against it. The flange IO, the disc il and the loop 52 may be secured togethf` by rivets 53 or otherwise.

A spring 54 is positloned within the space 2 and bears at one end against the bottoni of that space and at the other end against the disc 5|. This spring tends. when free to do so. to force the diaphragm upward. A spring ll engages the loop 52 at one end and at the other end engages the curved portion 58 of a lever arm 51. Ordinarily, the lower end 5| of the spring I! has formed in it an eye which is large enough to engage the member W loosely so that relative movement of these two parts is possible under certain conditions. The lever arm B1 has formed on it a spring seating member 59 about which is` seated a spring IO. One end of the spring bears against the lever arm 51 and the other bears against the inner surface of the passage I. II is a fuicrum member provided with a portion 02 which bears against the shoulder 9. It is provided with a second portion 03 which preferably bears against the outer face of the housing portion i adiacent the fiange 1. The fulcrum member is also provided with a retaining portion ll from which looking ears or lugs 8| are punched. These looking ears engage the inner surface of the space I and prevent withdrawal of the fulcrum member as a whole.

The lever arm 51 is preferably provided with a curved fulcrum engaging portion 66 which preferably has substantially the same curvature as the fulcrum member 8|. The outer end of the lever arm 51 may be curved as at 01 to receive a cuplike member ll within which the upper end of a push rod 69 is loosely received. The upper end of the rod may be rounded as at 1| if desired.

In the modified form of Figure 3 the parts shown are as described above except that the vapor dome has been omitted and in its place a cap 1| has been substituted. The cap is provided with a flange 12 similar to the fiange 41a which engages the packing member 41. At its upper end the cap may have a rectangular cross section as at 13 to receive a tool by means of which it can be rotated.

For some purposes the perforations 3 might be omitted. Where they are present, and they will generally be present, it may be desirable to provide means for filtering the air which passes through them. This is particularly important where the pump is to operate in a dusty atmosphere. When that is to be the case, an air filter is provided. As shown this filter comprises a quantity of vfiltering material 1| which is positioned in the bottom of the chamber 2 and about and over the perforations 3 so that air entering through any of the perforations must pass through this filter material 1|. A retainer is provided for the filter material. As shown it comprises an inwardly directed flange 15 against which the lower end of the spring 8| may rest. It comprises an upwardly directed portion 1B and a top outwardly directed fiange 11. This retainer may be held in place by the spring 5| alone or may be riveted, welded, screwed or otherwise faste'ned in place. Any other form of air filter might be provided and the one here shown is not to be taken as limlting the invention to any particular type of air filter. i

In Figure 4 there is shown a modiflcation 'of the means for positioning and 'centering the spring III. As there shown. the lever arm B1. instead of carrying the member II, is provided with a short and preferably conical projection 18 which may bemade integrally with the member l1: it may be punched out from it or welded or otherwise secured to it. In this form of the device, instead of having the spring nt loosely upon the floor of the passaae I. a pilot or centering device is provided and this includes preferably a threaded plug 1! which has on its upper end a pilot or centering member ll. The plug may be squared as at ll to receive a tool by means of which it may be rotated. The Plug is removably and adiustably received in a threaded perforation 82 in the floor of the chamber I. The member ll might, instead of being carried by a plug, be made as an integral part of the floor of the e I or might be separately made and permanentiy secured thereto. It furnishes a centering point for the spring Ill.

Althoug'h there is shown an operative form of the device, it will be understood that many changes in the form, shape and arrangement of parts might be made without departing from the spirit of this invention, and it is wished that the showing be taken as, in a sense, diagrammatic.

The use and operation of this invention are as follows:

When the pump is to be used it is put in position and a supply pipe or conduit is connected to the inlet opening |2 and a discharge pipe or conduit is connected to the outlet or discharge opening 21. Bome means are provided in the total assembly'for moving the push rod l! and for thus raising and lowering the lever arms S1. Any suitable means may be provided for causing the lever arm to rock. When the lever arm is raised it pulls downwardly on the spring li and thus moves the diaphragm downwardly. When the lever arm is permitted to fall. it no longer pulls down on the spring I! and the spring 5| is free to raise the diaphragm. Thus the diaphragm is alternately ralsed and lowered. When it is lowered suction is created. Thus the valve 2| is unseated. Fluid enters through the passage |2, passes through the filter 22 and downwardly through the iitting 2|. If the valve 2| has not been brought and moved down to be seated against the end of the member IS, liquid passes over' the end of that member and also passes through the notches ll. If the valve has been brought down to its full downward limit of movement, liouid still passes through the notch or notches ll. When the diaphragm is raised compression is developed in the pump chamber li. the valve 20 is seated and the valve 29 is opened against the resistance of the spring 3| and fuel is discharged through the outlet openine 21. The space 33 will ordinarily not be fiiled with liquid and this space acts as a vapor or pressure dome. This is true in the form of the device shown in Figure 3. In the form of the device shown in Figure l it is also true but there lis added the additional space enclosed within the vapor dome 38, 21. The shape of the bafile prevents proiection of liquid into the space above the baii'ie. Should the space in the member 36 fill with liquid, then the liquid could penetrate through the perforations 39 but as soon as presin place.

' and is compressed sure conditions permit, the liquid would .flow out through those perforations.. In ordinary 'operation and under certain pressure conditions, lthe i dome.

'The 'pump has been designed for ready assembly. For that purpose the construction of the fulcrum member is designed. To' install it it is necessary only that the pump be provided with a space 8 into which the tongued end of the member '64-is inserted, The tongues 65 are of spring material and they spring loutwardly and their outer points or ends engage the inner surface of the member 8.' Thus the member is merely pushed into vplace and thereafter holcls. itself The shoulder 9, if it is providedv and it need not be, serves asa positioning member for the fulcrurn member. o

The upper housing member 42 is fastened in place by the vapor dome member 36 or by the cap 1| either of which engage's the threading on the member' 35. Either the cap or the vapor dome is screwed down far enough to secure the housing member 42 in place and suflicient pressure is applied to compress the packing 44. l'I'he inclined surface 43 produces a better seal than can be producedv with two mating flat surfaces. The packing is forced outwardly-and downwardly against the inner edge of the member 42. L

Similarly, the packing 41 is compressed between the upper face of the member 42 and the incli'ned fiange 41a ,or 12 of the vapor dome or cap, as the case may be, and it may also be. cominner face or edge of the pressed against the bead 46.

I claim:

1. In combination in a pump, pump actuating means, a hollow housing formed of a plurality of separable' members, one of said members forming a chamber to receive said pump-actuating means, a second of said members forming a part of a pump chamber and providing support azeaeaa pump chamber, a valve positioned to control said outlet passage, said second' housing member provided with a portion having an internal guiding chamber, there being a guide positioned on said diaphragm and adapted normally to be loosely guided in said chamber, and a passage formed in taken by 'outgoing liquid, and .a pressure dome positioned in communication with said last mentioned passage.

3. In combination'in a pump, pump actuating means, a hollow housing formed of a plurality' of separable members, one of said members forming a chamber to receive said pump-actuating means, a second of said members forming a part of a pump chamber and providing support for valve parts, and a third of said members comprising a cover for saidsecond chamber, and a diaphragm positioned between said first and second members, an inlet passage to said pump chamber, a valve 'positioned to control said inlet, and a strainer in the inlet line, an outlet passage from said pump chamber, a valve positioned to control said outlet passage, said second housing member provided with a portion having an internal guiding chamber, there being'a guide positioned on said diaphragm and. adapted normally to be loosely guided in said chamber, and a passage.

formed in said second housing member and in the portion 'thereof in which said guiding chamber, is formed and extending away. from the direction normally taken by outgoing liquid, and a fixed to said diaphragm, one of said membersv v for valve parts, and a third of said members comprising a cover for-.said second member, and a diaphragm positioned within said pump, an inlet passage to said pump chamber, a valve positioned to control said inlet, an outlet passage from said pump chamber, a valve positioned to control said outlet passage, said second housing memberprovided with a portion having an internal guiding chamber, there being a guide positioned on said diaphragm and'adapted normally to be loosely vguided in said chamber, and a passage formed in 'of the pump chamber and providing'support' forvalve parts, and a third of said memberscomprising a cover for said second member, anda diaphragm positioned withinsaid pump, an inlet passage to said pump chamber, a valve positioned to control said inlet, an outlet passage from said pressure dome positioned in communication with said last mentioned passage. v

4. In combination in a liquid pump, separable members defining a pump housing, a diaphragm positioned between-two of said members and forming one wall of a pump chamber, a guide cooperating with said diaphragm to form the other vwall of said chamber, there being an inlet and an outlet for said chamber, the maximum diameters of said housing members lying substantially within the diameter of said diaphragm, the housing member which provides one wall of said pump chamber having a central hollow stem. said stem having a guide chamber formed in it and a separate fluid passage formed in it, a closure for said separate passage, said guide'l being movable within said guide chamber.

5. In combination in aliquid pump, separable members defining a pump housing, a diaphragm .positioned between two of said members land forming one wall. of a pump chamber, a guide I fixed to said diaphragm, one of said members cooperating with said'diaphragm to form the' other wall of said'chamber, there being an inlet and an outlet for said chamber, theV maximum diameters of said housing membersl lying substantially within the diameter of said diaphragm, the'housing member which provides one wall of said pump chamber having a central hollow stem,

` 'said stem having a guide chamber formed in it 'and a separate fiuid passage formed in it, a closure for said separate passage, said stem extending outwar d1y beyond the housing, said ,guide being positioned and adapted to move in said guide chamber, and a retaining member adapted to be removably seated upon said stem and, when so seated, to hold two of said housing members removably together.

6. In combination in a liquid pump, separable members defining a pump housing, a diaphragm.

positioned between two of said members and forming one wall of a'pump chamber, a guide 'fixed to said diaphragm, one of said members cooperating with said diaphragm to form the other .wall of said chamber, there being an inlet and an outlet for said chamber, the maximum diameters of said housing members lying substantially within the diameter of said diaphragm, the housing member which provides one wall of said pump chamber having a central hollow stem, said stem having a guide chamber formed in it and a separate fluid passage formed in it, and a vapor dome in communication with said separate passage, said stem extending outwardly beyond the housing, and a retaining member adaptedto be removably seated upon said stem and, when so seated, to hold two of said housing members removably, together, said retaining member comprising a hollow pressure dome in` communication with the passage formed in said stem, said guide being positioned and adapted to move in said guide chamber. I g

.7. In combination in a liquid pump, separable members deflning a pump housing, a diaphragm positioned between two of said members and forming one wall of a pump chambena guide fixed to said diaphragm, one of said members meml'iersv provided' with an inlet passage; a valve seat ,and valve-supporting means contained in said member and positioned within the inlet line rsaid member provided' also with an outlet passage, a valve seat and valve support positioned in said ,outlet passage, and a hollow stem formed integrally with said member and providing a fluid passage directed away from said outlet passage,

' and a closure for said fluid passage.

other wall of said chamber, there being an inlet and an outlet for said chamber, the maximum diameters of said housing members lying substantially within'the diameter of said diaphragm, the housing member which provides one wall of said pump chamber having a central vhollow stem, said stem having a guide chamber formed in it and a separate fluid passage formed in it, and a vapor dome in communication with said separate passage, said stem being threaded at'its outer end, said stem extending outwardlz,1 beyond the housing, and a correspondingly threaded retaining member adapted tobe removably seated upon said stem and, when so seated, to hold two of said housing members removably together. said guide being positioned and adapted to move in said guide chamber.

8. In combination in a liquid pump, separable members deiining a pump housing, a diaphragm positioned between two. of said members .and forming one wall of apump chamber, a guide fixed to said diaphragm, one of said members cooperating with said diaphragm to form the other' wall of said chamber, there being an inlet yond the housing, and a correspondingly threaded retaining member adapted to be removably seated upon saidstem and, when so seated, to hold two of said housing members removably together, said retaining member comprising a hollow pressure dome in communication with the passage formed in said stem, said guide being positioned and adapted to move insaid guide chamber.

9. Izi combination in a pump, a plurality of hollow housing members therefor. one of said iii 11. In combination in a pump, apluralityof hollow housing members ltherefor. one of said members provided with an inletvpassage, a valve seat and valve-supporting means contained in said member and positioned within the inlet line of fluid iiow through said member, said member provided also with an ,outlet passage, a valve seat and valve support positioned in. said outlet passage, and a hollow stem ...rmed integrally with said member and providing a fluid passage div rected away from said outlet passage. and a vapor dome in communication with said last-mentioned fluid passage, and means within said housing member and'in line with said inlet passage 4for receiving and supporting a filter.

. through said member, said member provided also with an outlet passage, a valve seat and valve supporiI positioned in said outlet passage, and a hollow stem formed integrally with said member and providing a fiuid passage directed away from said'loutlet passage and providing also a guide chamber, for said diaphragm guide, and

a vapor dome in communication with said lastmenticned fluid passage.

. 13. In combination in a pump, a plurality of hollow housing members therefor, and a diaphragm, having a guide fixed to it, mounted within said pump. one of said members provided with an inlet passage, a notched valve seat and valve-supporting means voontained in said member and positioned within theinlet line of fluid flow through said member. said member provided v,also with' an outlet passage, a valve seat and valve support 'positioned in said outlet passage. and a hollow stem formed integrally .with said member and providing a fluid passage directed away from said outlet passage and providing also a'guicie chamber. for said diaphragm guide, and a closure for said last-mentioned fluid passage. and means within said housing member and in line with said inlet passage for receiving and supporting a filter.

- CHARLES A. ERICKSON. 

